package cn.itcast.gateway.filter;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;


//自定义过滤器
//@Order(-1)
//@Component
public class AuthorizeFilter implements GlobalFilter {
    /**
     * 过滤方法
     * @param exchange  请求上下文  包含请求对象request  响应对象response
     * @param chain     过滤器链
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        //1.获取请求对象
        ServerHttpRequest request = exchange.getRequest();

        //2.获取请求参数  authorization 的值    路径?authorization=admin
        MultiValueMap<String, String> queryParams = request.getQueryParams();
        String authorization = queryParams.getFirst("authorization");
        //3.判断是否等于admin
        if ("admin".equals(authorization)){
            //4.如果等于admin,放行请求 不要忘记加return
           return chain.filter(exchange);
        }
        //5.如果不等于admin,终止请求
        ServerHttpResponse response = exchange.getResponse();
        //设置状态码
        response.setStatusCode(HttpStatus.UNAUTHORIZED);

        return response.setComplete();//终止请求
    }
}
